fix for generated execution file dumpling collection   -updated core file existence check to use regex instead of looking for only 'core'   -removed non-working sudo solution to set core_pattern
fix for generated execution file dumpling collection
  -updated core file existence check to use regex instead of looking for only 'core'
  -removed non-working sudo solution to set core_pattern

leculver/dotnet-reliability,leculver/dotnet-reliability,leculver/dotnet-reliability,leculver/dotnet-reliability,leculver/dotnet-reliability,leculver/dotnet-reliability